B.P.S.C. School Teacher/Headmaster 09.12.2023
The average age of 4 sisters and their mother is 7 years. If we add the mother's age to this, the average age increases by 6 years. The mother's age will be-
a37 years✓ Correct
b42 years
c34 years
dMore than one of the above
eNone of the above
Explanation
Let's assume mother's age = $x$ years According to the question $4 \times 7 + x = 5 (7 + 6)$ $28 + x = 5 \times 13$ $x = 65 – 28$ $x = 37$ years
general-mental-ability
